Removed qwlroots and waylib from git submodules, and merged their
source code directly into the treeland repository. This change
reduces development overhead during the rapid iteration phase of
treeland, as frequent coordinated changes are required across
treeland, qwlroots, and waylib. By merging them now, we simplify
development and maintenance. In the future, when the project
stabilizes, we may consider splitting them back into independent
repositories.
To prepare for this possible future split, the original directory
structures and all files from qwlroots and waylib are preserved and
placed under separate subdirectories in treeland.
Original project commits at the time of merge:
- qwlroots: https://github.com/vioken/qwlroots(00b09f9047ac0eaf26757e8af3d31f35d22bbce3)
- waylib: https://github.com/vioken/waylib(9564027cc6c89dc5262c03d183f743b71a0e621e)
重构：将 qwlroots 和 waylib 项目代码合并到 treeland
将 qwlroots 和 waylib 从 git 子模块中移除，直接把它们的代码合并
到 treeland 项目中。这样做是为了在 treeland 快速迭代期间减少开发
成本，因为经常需要同时修改 treeland、waylib 和 qwlroots，合并后
开发会更方便，待项目稳定后再考虑重新拆分为独立项目。
为方便将来拆分，保留了原项目的目录结构和全部文件，并使用独立子
目录维护代码。
合并时原项目的提交信息如下：
- qwlroots: https://github.com/vioken/qwlroots(00b09f9047ac0eaf26757e8af3d31f35d22bbce3)
- waylib: https://github.com/vioken/waylib(9564027cc6c89dc5262c03d183f743b71a0e621e)
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