Tweak some settings according to feedback

[janhohenheim]

Thanks to Thierry Berger for providing the feedback that this PR is based on!

• Moves editor key to "G"
• Improves compile times a bit
• Removes all external deps by default (lld, zld, clang)
• Removes default lld linker -> no more linker errors requiring rebuilds
• Removes all cargo features and instead automatically sets up the right dependencies, except for the dev feature which is always active by default