TreeMaker 5.1.1M beta

Fixing of null pointers, overflows, old standards and other violations.

What's Changed

• Move all build steps into CMake by @BogdanTheGeek in #1
• wip: fix basic violations by @vishvish in #2
• fix: buffer overflows by @vishvish in #3
• Fix use of memory after being freed by @vishvish in #4
• wip: memory leak fix by @vishvish in #5
• fixes: null pointers and references by @vishvish in #6
• Ongoing fixes by @vishvish in #7

New Contributors

• @BogdanTheGeek made their first contribution in #1
• @vishvish made their first contribution in #2

Full Changelog: v5.1Mbeta...v5.1.1M-beta