lsp: unified PIDE/decorations and dynamic output decorations format;

vscode: changed test_string to "mix" to be consistent with jEdit;

lsp: added decorations to dynamic output;

lsp: force update after state_set_margin;

vscode: added dynamic and state output set margin messages to vscode extension;

lsp: made margins synchronized;

lsp: added separation for non-html output and state;

lsp: tuned;

lsp: clarified preview_request;

lsp: added Symbols_Request;

lsp: added Output_Set_Margin and State_Set_Margin Notifications;

lsp: changed State_Init notification into a request and removed State_Init_Response;

lsp: tuned;

lsp: updated ErrorCodes;

lsp: added State and Dynamic Output html_output and margin handling;

lsp: added vscode_html_output option;

tuned formatting;

lsp: partially revert c0388fbd8096 to get decorations for all keywords;

lsp: added State_Init_Response message;

lsp: removed change_document normalization because it causes desyncs;

clarified inner-syntax markup, notably for enumerations: prefer "notation=mixfix" over "entity" via 'syntax_consts' (see also 70076ba563d2);

less markup: prefer "notatation" over "entity";

clarify comparison of output: ignore token positions, which are somewhat accidental;

clarified order of markup: more uniform input vs. output;

misc tuning;

clarified parse tree: always provide root node;

tuned signature;

tuned markup;

clarified markup: avoid conflict of "notation" with "entity", e.g. in "[x,y,z]" without spaces;

more flexible command syntax;

less markup (amending 07ad0b407d38): const = "" is mainly for parentheses syntax -- avoid entity_markup here;

more markup reports: notably "notation=..." within pretty blocks;

more parse tree positions;

more operations;

clarified order for 'print_syntax' command;

more accurate parse tree: retain all tokens (and thus positions);

more thorough markup reports (amending 0c6a600c8939 and 7f9e8516ca05): descend into vacuous nodes;

clarified comparison: prefer authentic nonterminal context, instead of somewhat accidental "const";

more detailed parse tree: retain nonterminal context as well;

clarified persistent data;

clarified input and output: support markup blocks via Bg/En; clarified datatype tree vs. tree_ops: reconstruct nested markup blocks via make_tree; clarified tree_ops_ord: ignore markup blocks, proceed like dict_ord;

tuned;

tuned;

more operations;

clarified output: count Tip entries;

tuned signature;

tuned whitespace;

clarified signature: more explicit type "output"; minor performance tuning of output_ord: static length;

clarified signature;

tuned: more uniform;

tuned: more uniform;

tuned;

minor performance tuning;

tuned;

tuned;

minor performance tuning;

partial revert of d97fdabd9e2b, to build old documentation more reliably;

tuned signature;

tuned signature;

tuned signature;