Add SQL, Erlang, and Forth highlighter implementations and tests for LSP process and transport handling.

- Added highlighters for new languages (SQL, Erlang, Forth) with filetype recognition.
- Updated and reorganized syntax files to maintain consistency and modularity.
- Introduced LSP transport framing unit tests and JSON decoding/dispatch tests.
- Refactored `LspManager`, integrating UTF-16/UTF-8 position conversions and robust diagnostics handling.
- Enhanced server start/restart logic with workspace root detection and logging to improve LSP usability.

kte-cloc

@@ -6,4 +6,4 @@ then
 	fmt_args="-fmt 3"
 fi
 
-ls -1 *.cc *.h | grep -v '^Font.h$' | xargs cloc ${fmt_args}
+ls -1 *.cc *.h lsp/*.{cc,h} | grep -v '^Font.h$' | xargs cloc ${fmt_args}