first pass of install targets
remove html generation for now, fix copy to not result in an extra layer of each subdir
Move checkCTFEable to std.exception.assertCTFEable, and use it
fix Issue 10220 - `array` doesn't work with disabled default construction
Merge pull request #1324 from braddr/install

draft install target
Fix std.datetime (remove ReturnType usage for property check)
Fix internal template GetOverloadedMethods - should see overload first
Merge pull request #1331 from 9rnsr/fix1983

Supplemental change for Issue 1983 - Delegates violate const
Merge pull request #1329 from 9rnsr/fix10220

[REG2.064a] Issue 10220 - `array` doesn't work with disabled default construction