Aqtinstall

Fixed
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* Fix Qt6/Android installation handling.(193, 200)

Fixed
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* Fix Qt6/Android installation handling.(193, 200)

When main download site is down, automatically fallback to mirror site.

Added
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* Add LTS versions as known version.(188)

Changed
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* Tool: Version comparison by startswith.
When specified 4.0 but download server hold 4.0.1, it catch 4.0.1.(related 187)
* README: explicitly show python version requirements.

Added
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* Add v5.12.2, v6.0.0 as known versions.(176, 177)
* Support --archives option on src installation.

Changed
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* Use multiprocessing.Pool instead of concurrent.futures(178)
* Refactoring whole modules. (179)
* Split old changelogs to CHNAGELOG_prerelease.rst
* Drop an upper limitaion (<0.11) for py7zr.(183)

Fixed
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* When we used "-m all" to download doc or examples, Qt sources are also downloaded(Gamso)(182)