pipe covers + silo tank fluid box fixes

data.lua

@@ -1,3 +1,4 @@
+require('prototypes/pipe_covers')
 require('prototypes/electronic/el_solar')
 require('prototypes/electronic/el_tank')
 require('prototypes/electronic/el_water_generator')
@@ -16,7 +17,6 @@ require('prototypes/electronic/el_diesel_train')
 require('prototypes/electronic/el_train_fuel')
 require('prototypes/electronic/el_train_equipment')
 require('prototypes/electronic/el_energy_crystal')
-
 require('prototypes/electronic/el_arc_furnace')
 require('prototypes/electronic/el_caster')
 require('prototypes/electronic/el_purifier')
@@ -35,7 +35,6 @@ require('prototypes/fission/fi_crushed')
 require('prototypes/fission/fi_energy_crystal')
 require('prototypes/fission/fi_robo')
 require('prototypes/fission/fi_modules')
-
 require('prototypes/fission/fi_fiberer')
 require('prototypes/fission/fi_compound_machine')
 require('prototypes/fission/fi_castor')
@@ -51,11 +50,9 @@ require('prototypes/fusion/fu_activator')
 require('prototypes/fusion/fu_star_engine/fu_star_engine_core')
 require('prototypes/fusion/fu_star_engine/fu_star_engine_cooler')
 require('prototypes/fusion/fu_star_engine/fu_star_engine_cooler_up')
---require('prototypes/fusion/fu_star_engine/fu_star_engine_caster')
 require('prototypes/fusion/fu_star_engine/fu_star_engine_heater')
 require('prototypes/fusion/fu_star_engine/fu_star_engine_heater_left')
 require('prototypes/fusion/fu_space_probe')
-
 require('prototypes/fusion/fu_laser')
 require('prototypes/fusion/fu_plasma')
 require('prototypes/fusion/fu_materials')

prototypes/electronic/el_tank.lua

@@ -82,6 +82,7 @@ data:extend({
             height = 1,
             base_level = 0,
             pipe_covers = pipecoverspictures(),
+            pipe_picture = grey_south_pipe_picture,
             pipe_connections =
             {
               {type = "input-output", position = {-4, 1}},

prototypes/pipe_covers.lua

@@ -0,0 +1,123 @@
+local function sprite(name)
+    return "__248k__/ressources/pipe_covers/"..name..".png"
+end
+
+empty_sprite = {
+    filename = sprite("64_empty"),
+    priority = "high",
+    width = 64,
+    height =64
+}
+
+assembler_pipe_picture = {
+    north = {
+        filename = sprite("north_covers"),
+		priority = "high",
+		width = 71,
+        height = 38,
+        shift = util.by_pixel(2.25, 13.5),
+        scale = 0.5
+    },
+    south = {
+        filename = sprite("south_covers"),
+		priority = "high",
+		width = 88,
+        height = 61,
+        shift = util.by_pixel(0, -31.25),
+        scale = 0.5
+    },
+    west = {
+        filename = sprite("west_covers"),
+		priority = "high",
+		width = 39,
+        height = 73,
+        shift = util.by_pixel(25.75, 1.25),
+        scale = 0.5
+    },
+    east = {
+        filename = sprite("east_covers"),
+		priority = "high",
+		width = 42,
+        height = 76,
+        shift = util.by_pixel(-24.5, 1),
+        scale = 0.5
+    }
+}
+
+basic_pipe_picture = {
+    north = {
+        filename = sprite("north_covers"),
+		priority = "high",
+		width = 71,
+        height = 38,
+        shift = util.by_pixel(2.25, 13.5),
+        scale = 0.5
+    },
+    south = {
+        filename = sprite("south_covers"),
+		priority = "high",
+		width = 88,
+        height = 61,
+        shift = util.by_pixel(0, -31.25),
+        scale = 0.5
+    },
+    west = {
+        filename = sprite("west_covers"),
+		priority = "high",
+		width = 39,
+        height = 73,
+        shift = util.by_pixel(25.75, 1.25),
+        scale = 0.5
+    },
+    east = {
+        filename = sprite("east_covers"),
+		priority = "high",
+		width = 42,
+        height = 76,
+        shift = util.by_pixel(-24.5, 1),
+        scale = 0.5
+    }
+}
+
+south_pipe_picture = {
+    north = empty_sprite,
+    south = {
+        filename = sprite("south_covers"),
+		priority = "high",
+		width = 88,
+        height = 61,
+        shift = util.by_pixel(0, -31.25),
+        scale = 0.5
+    },
+    west = empty_sprite,
+    east = empty_sprite
+}
+
+grey_south_pipe_picture = {
+    north = empty_sprite,
+    south = {
+        filename = sprite("south_covers_grey"),
+		priority = "high",
+		width = 88,
+        height = 61,
+        shift = util.by_pixel(0, -31.25),
+        scale = 0.5
+    },
+    west = empty_sprite,
+    east = empty_sprite
+}
+
+north_south_basic_pipe_picture = {
+    north = empty_sprite,
+    south = {
+        filename = sprite("south_basic_covers"),
+		priority = "high",
+		width = 55,
+        height = 50,
+        shift = {0.01, -0.58},
+        scale = 0.5
+    },
+    west = empty_sprite,
+    east = empty_sprite
+}
+