Add support for runes
Add raw strings
Fix highlighting for numbers
Remove non-keywords

Signed-off-by: Sebastian <sebastian@sebsite.pw>
Add 'case' keyword and increase priority for 'use'
Apply further recommendations

- Strings are now italic
- Numbers are more grey
- The README screenshot now shows numbers
Follow recommendations from Bryon
Improve number handling and trailing whitespace
Fix a few keywords
Initial Commit