Add dofile() to Lua

This lets PK3 files (not WAD and other formats) decide of the order in which to load their Lua scripts, by creating a Init.lua entry at the root (actual root, not the Lua folder) and then calling dofile("Path/To/Some/Script.lua") to load individual scripts (inside the Lua folder this time).

changed title from Add {-dofile-} to Lua to Add dofile() to Lua

changed the description

added 27 commits

• 1dbb7557...04c7eeb6 - 26 commits from branch next
• 6895d7df - Merge branch 'next' into 'dofile'

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added 1 commit

• 286b316c - Fix dofile() return incorrect values

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merged

mentioned in commit 23226444