Presets: value field of cache variables should support boolean type

Originally mentioned in !5366 (comment 845728)

In a CMakePresets.json or CMakeUserPresets.json file, cache variables currently only support being specified as a quoted string. If the variable type is BOOL, then it should also be legal to specify the value as a JSON boolean (i.e. true or false without quotes). This should be accounted for in both the implementation and the JSON schema.

Edited Oct 17, 2020 by Craig Scott

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