5b0430f94b
find_file contained a lot of code for searching textures in ways that haven't been relevant for years. For example, it had workarounds for MCPatcher, a tool that hasn't been updated since 2015. Instead of searching in multiple paths that will never succeed in a resource pack and Minecraft version that actually work, just look for the filename that the block functions ask for. Also, if we already have a manually specified resource pack open, we shouldn't repeatedly re-open it. Furthermore, it's best if the very first thing find_file does is try to find the file in the resource pack or client jar we've already opened previously. We can now also remove chest.png, ender.png, foliage.png, grass.png and normal_double.png because Minecraft ships them, so we don't need to ship them ourselves too. Us shipping them actually hid the whole find_file garbagefire. Concerns issue #1604.
