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;

lsp: added support for code actions to apply active sendback markups;

lsp: clarified WorkspaceEdit;

lsp: made TextDocumentEdit accept optional versions;

lsp: tuned;

lsp: removed code that is never run;

lsp: created distinction for unicode symbols setting between output and edits and clarified output text functions;

clarified PIDE/line range conversions;