refactor: redesign css library and parser

[commit-lint[bot]]

Documentation

• add libcss design document (f3b12b1)

Code Refactoring

• redesign CSS Library API (14c9de4)
• redesign CSS Parser API (0c03ee5)
• redesign libcss header files (167a5be)
• css: add some font style properties as preset properties (a67dbb4)
• css: css_unit_value_t::type -> css_unit_value_t::unit (af16465)

Contributors

lc-soft

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[codecov[bot]]

Codecov Report

Merging #252 (5240512) into v3.0-dev (1ba47d9) will increase coverage by 0.07%. The diff coverage is 69.03%.

:exclamation: Current head 5240512 differs from pull request most recent head af16465. Consider uploading reports for the commit af16465 to get more accurate results

@@             Coverage Diff              @@
##           v3.0-dev     #252      +/-   ##
============================================
+ Coverage     50.55%   50.63%   +0.07%     
============================================
  Files            92       96       +4     
  Lines         15199    15258      +59     
============================================
+ Hits           7684     7726      +42     
- Misses         7515     7532      +17     

Impacted Files	Coverage Δ
lib/platform/include/platform.h	0.00% <ø> (ø)
lib/text/src/textstyle.c	21.68% <0.00%> (ø)
lib/ui-builder/src/builder.c	69.31% <ø> (ø)
lib/ui-cursor/src/cursor.c	0.00% <ø> (ø)
lib/ui-server/src/server.c	12.80% <0.00%> (ø)
lib/ui-widgets/src/button.c	81.81% <ø> (ø)
lib/ui-widgets/src/sidebar.c	15.68% <ø> (ø)
lib/ui-widgets/src/textcaret.c	51.02% <ø> (ø)
lib/ui/src/ui_logger.c	0.00% <0.00%> (ø)
lib/ui/src/ui_widget_attributes.c	78.84% <0.00%> (ø)
... and 33 more

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