Add per-file LSP activation rules allowpaths, blockpaths

[pavoljuhas]

Add optional items allowpaths, blockpaths for the server_info dictionary. allowpaths and blockpaths are lists of regular expressions matched on the full path of the active file. LSP is enabled if the current buffer matches any pattern in the allowpaths or when allowpaths is not present in the server_info dictionary. LSP is disabled if any of the blockpaths patterns matches the current file. The blockpaths rule has priority when both allowpaths and blockpaths match.

The allowpaths and blockpaths are consulted only when LSP is enabled by the allowlist, blocklist rules for buffer filetypes.

Fixes #1041

[prabirshrestha]

Can we use a function instead of a list, such that any custom code can be allowed?

[pavoljuhas]

Sure, I'll get to it in next few days.

[prabirshrestha]

Can you also fix the lint issues. Do sync with the latest master branch too.

[lilydjwg]

I'm seeking for lsp that can be manually enabled on a per project basis, because I want to avoid resource usage for files I read and copy from.

[pusewicz]

@pavoljuhas Are you still interested in merging this PR? Would you mind addressing the feedback? Thanks!

[stale[bot]]

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