Support aliases (strictly).

[LumaKernel]

If you alias this source to two or more names, the global environment variable are conflicted.

Lua evaluation is exclusive, but async function in TypeScript may be interrupted by other operations at right after the await statement.

escapeVimAutoloadName is for escaping Unicode sequences into vim variable compatible names. eg:

• 012abcABC -> 012abcABC
• lsp/ts -> lsp_47_ts
• a-b_c -> a_45_b_95_c

Converting with escaping _ to make this injective (=reversible).

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I personally make escapeVimAutoloadName / escapeVimAutoloadNameCached as public domain, so if other source creators see this, please feel free to copy it.

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@Shougo It's maybe ready but not tested except escapeVimAutoloadName. Please test.

[LumaKernel]

And invocations of members of the source (eg: gatherCandidates) may be shuffled after calling ddc#refresh_candidates because ddc.vim uses await before calling them.

[LumaKernel]

(fixing lua side...)

[LumaKernel]

sorry, done (maybe)

[Shougo]

Thanks. Merged.