builtin_map does not exists and makes shabang detection to fail

[leiserfg]

filetype.nvim/lua/filetype/init.lua

Line 240 in 295e107

shebang = builtin_map.shebang[shebang] or shebang

[leiserfg]

While trying to fix this I noticed that there are several instances of dead code (redefined functions/functions that are never called...), should I correct them or are they WIP code?
For instance try_all_maps is not called and has errors, analyze_shebang has two definitions.

[nathom]

This issue, along with the dead code was the result of a pretty bad merge that I made. Thanks for the fix.

[leiserfg]

It will be nice to have something like https://github.com/vitalk/vim-shebang as in some cases the program and the filetype name don't match.