Add missing textures and models from Chorus' Version

This also helps in preparing for the Nether Update (1.16). Textures were
optimised using OptiPNG by:

optipng -o7 -nx

followed by a second run with the defaults.

assets/minecraft/textures/block/beacon.png.mcmeta

@@ -0,0 +1,7 @@
+{
+	"animation": {
+        "frametime": 100,
+		"interpolate": true,
+		"frames": [0, 1, 2, 3, 4, 5]
+	}
+}

assets/minecraft/textures/block/betterleaves/betterleaves.json

@@ -0,0 +1,8 @@
+{
+	"__comment": "Fair warning, this format is highly likely to change even more in the future!",
+	"parent": "block/betterleaves/betterleaves",
+	"textures": {
+		"all": "blocks/betterleaves/leaves_oak_round",
+		"extra": "blocks/betterleaves/better_leaves_oak"
+	}
+}

assets/minecraft/textures/block/chain_command_block_back_e.png.mcmeta

@@ -0,0 +1,6 @@
+{
+	"animation": {
+	"interpolate": false,
+	"frames": [ {"index": 0, "time": 40}, {"index": 1, "time": 5}, {"index": 0, "time": 10}, {"index": 1, "time": 1}]
+	}
+}

assets/minecraft/textures/block/chain_command_block_front_e.png.mcmeta

@@ -0,0 +1,6 @@
+{
+	"animation": {
+	"interpolate": false,
+	"frames": [ {"index": 0, "time": 40}, {"index": 1, "time": 5}, {"index": 0, "time": 10}, {"index": 1, "time": 1}]
+	}
+}

assets/minecraft/textures/block/chain_command_block_side_e.png.mcmeta

@@ -0,0 +1,6 @@
+{
+	"animation": {
+	"interpolate": false,
+	"frames": [ {"index": 0, "time": 40}, {"index": 1, "time": 5}, {"index": 0, "time": 10}, {"index": 1, "time": 1}]
+	}
+}

assets/minecraft/textures/block/command_block_back_e.png.mcmeta

@@ -0,0 +1,6 @@
+{
+	"animation": {
+	"interpolate": false,
+	"frames": [ {"index": 0, "time": 40}, {"index": 1, "time": 5}, {"index": 0, "time": 10}, {"index": 1, "time": 1}]
+	}
+}

assets/minecraft/textures/block/command_block_front_e.png.mcmeta

@@ -0,0 +1,6 @@
+{
+	"animation": {
+	"interpolate": false,
+	"frames": [ {"index": 0, "time": 40}, {"index": 1, "time": 5}, {"index": 0, "time": 10}, {"index": 1, "time": 1}]
+	}
+}

assets/minecraft/textures/block/command_block_side_e.png.mcmeta

@@ -0,0 +1,6 @@
+{
+	"animation": {
+	"interpolate": false,
+	"frames": [ {"index": 0, "time": 40}, {"index": 1, "time": 5}, {"index": 0, "time": 10}, {"index": 1, "time": 1}]
+	}
+}

assets/minecraft/textures/block/desktop.ini

@@ -0,0 +1,38 @@
+[LocalizedFileNames]
+magma.png=@magma,0
+magma.png.mcmeta=@magma.png,0
+cobble_wall_top.png=@cobble_wall_top,0
+mossy_cobblestone.png=@mossy_cobblestone,0
+cobble_mossy_wall_side.png=@cobble_mossy_wall_side,0
+cobble_wall_side.png=@cobble_wall_side,0
+cobblestone1.png=@cobblestone1,0
+cobblestone2.png=@cobblestone2,0
+cobblestone.png=@cobblestone,0
+cobble_mossy_wall_top.png=@cobble_mossy_wall_top,0
+smooth_stone.png=@smooth_stone,0
+smooth_stone_slab_side.png=@smooth_stone_slab_side,0
+quartz_pillar_top.png=@quartz_pillar_top,0
+quartz_pillar.png=@quartz_pillar,0
+quartz_block_top.png=@quartz_block_top,0
+quartz_block_bottom.png=@quartz_block_bottom,0
+quartz_block_side.png=@quartz_block_side,0
+chiseled_quartz_block_top.png=@chiseled_quartz_block_top,0
+chiseled_quartz_block.png=@chiseled_quartz_block,0
+orange_tulip.png=@orange_tulip,0
+anvil_base.png=@anvil_base,0
+anvil_side.png=@anvil_side,0
+anvil_top.png=@anvil_top,0
+anvil.png=@anvil,0
+chipped_anvil_top.png=@chipped_anvil_top,0
+damaged_anvil_top.png=@damaged_anvil_top,0
+stripped_birch_log.png=@stripped_birch_log,0
+stripped_birch_log_top.png=@stripped_birch_log_top,0
+birch_planks1.png=@birch_planks1,0
+nether_bricks_fence.png=@nether_bricks_fence,0
+nether_bricks.png=@nether_bricks,0
+light_blue_wool.png=@light_blue_wool,0
+nether_wart_block.png=@nether_wart_block,0
+prismarine_bricks.png=@prismarine_bricks,0
+prismarine.png=@prismarine,0
+prismarine.png.mcmeta=@prismarine.png,0
+mossy_stone_bricks.png=@mossy_stone_bricks,0