lsp: improved completions;

vscode: removed unused code;

vscode: removed README because its content is outdated;

vscode: disabled whitespace rendering by default because the whitespace symbol is not monospace;

lsp: added symbol conversion request;

vscode: changed how options are inserted into package.json so that one can still call `npm install` without errors;

vscode: removed unused import;

vscode: changed vscode_unicode_symbols_edits option default to true;

vscode: made uri equality check on actual strings, not on the functions;

vscode: switched document_decoration map to use strings as keys instead of Uris, because Uri equality check is inconsistent; disabled decoration requests as decoration caching is already done on client-side;

lsp: added rudimentary indenting to code actions;

vscode: adjusted setting description;