Lunatik v3.0

• updated Lua version to 5.4.4
• added support for Linux kernel 5.x
• moved lua/ to a submodule
• added lunatik APIs
• added device and linux libraries
• added basic documentation
• added lunatik device driver
• added lunatik command-line tool
• added support for loading files
• added support for autogenerating exported symbols
• cleaned up build warnings
• removed support for os library and math.random() API
• added support for math.abs(), math.tointeger() and math.ult()
• cleaned up luaconf.h