Code cleanup and performance improvements

[NonSwag]

Description

This PR is rather unorganized, but in general it provides code quality and performance improvements

• replaced XMaterials with Bukkit Materials
• reworked how brushes work
• removed unused and redundant code
• abstracted brush settings to fight duplication
• optimized brush algorithms
• added proper error handling for fawe config creation
• removed every static access to main class
• organized almost every file
• added a new brush called Underlay

Temporarily replaced the old broken surface mode algorithm with a simpler, faster and more intuitive one

known issue: exported brushes cannot be parsed anymore

I tested it quite a bit but cannot yet ensure that nothing else is broken

Checklist

• I included all information required in the sections above
• I tested my changes and approved their functionality
• I ensured my changes do not break other parts of the code
• Add a setting to the GUI to use either the old or new surface mode
• Port to fawe brushes (or as temp solution fix the parsing)

[theEvilReaper]

Small point to check

[sonarqubecloud]

Quality Gate passed

Issues
25 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[NonSwag]

From my standpoint, there is nothing that needs to be addressed anymore.
All bugs, issues, inconsistencies and unwanted side effects that I could find are fixed now.
If you don't have anything to add, this pr is ready to be merged.