vscode: further adjusted default settings and wordPattern for consistent completion popups; for some reason wordPattern must be set to match (almost) everything, otherwise completions only pop up every other character, and then we must disable wordBasedSuggestions or it will suggest whole lines out of the document;

lsp: added more triggerCharacters to make completion popups more consistent;

vscode: added default setting to make completions pop up by themselves;

lsp: improved completions;

vscode: removed unused code;

vscode: removed README because its content is outdated;