LSP: auto-complete symbols via the textDocument/completion request

This currently only works in insert commands after enabling the immediate
editing modifier via CTRL+G and if the LSP was already launched
(e.g. by an explicit `FT$`).
File name completions are still performed with an activated ^G modifier
only if the LSP is shut down.

Just like for file names, the modifier is automatically cancelled after
a successful completion - there is little sense in completing several
symbols in a row.

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