Assert that `MRB_METHOD_CACHE_SIZE` is a power of 2

Assign after `mrb_irep_incref()` in `mrb_proc_new()`

Call functions directly from `mrb_ensure_float_type()`

Adjusting the stack for after it enters the virtual machine

ref. 28ccc664

The `mrb_static_assert_powerof2()` macro has been introduced for this purpose.

It may cause broken reference count numbers.

ref. commit 7f40b645

Currently, the build configurations `MRB_USE_COMPLEX` and `MRB_USE_RATIONAL` are not listed in the documentation.
In other words, they are hidden settings.
They are defined in `mrbgems/mruby-{complex,rational}/mrbgem.rake`.
So this patch assumes that it is safe to refer to these functions in core-gems directly from core functions.

However, applications that link with `libmruby_core.a` will have compatibility issues.
In fact, `mrbgems/mruby-bin-mrbc` links with `libmruby_core.a`, so I had to prepare a dummy function.

Remove code duplication.

Extend the Cygwin CI time limit to 15 minutes.

Get object properties after `mrb_get_args()`

Since they are basically duplicated functionality. `mrb_as_float` is now
a macro defined using `mrb_ensure_float_type`; #5620

It should only call `to_f` for Rational and Complex numbers.
Ref #5540 #5613 #5620

That reduce memory consumption by iv/mt tables.

The main reason for failure is to exceed the time limit, and even when it succeeds, there is less than a minute left.
The 10-minute time limit seems to be too short.

ref. #5613.

I mentioned in #5540 that there was no reentrant to the virtual machine, but in fact it was still a possibility at that point.
Also, the variable `ci` needs to be recalculated at the same time.

ref. #5613

I checked with Valgrind, and the methods that can cause use-after-free are `Array#rotate`, `Array#rotate!`, and `String#byteslice`.
Since `String#rindex` uses `RSTRING_LEN()` indirectly inside the function, no reference to the out-of-bounds range is generated.

Since `mrb_to_integer` and `mrb_to_float` does not convert the object
but checks types, they are named so by historical reason. We introduced
properly named functions.

This commit obsoletes the following functions:

* mrb_to_integer()
* mrb_to_int()
* mrb_to_float()

Use `mrb_ensure_int_type()` instead for the first 2 functions. Use
`mrb_ensure_float_type()` for the last.

mruby have removed `to_int` implicit conversion, so `mrb_to_integer`
should not call `to_i` for conversion.

The `ARY_PTR` and `ARY_LEN` may be modified in `mrb_get_args`.

Fix build error and refine definition of `ssize_t` on MSVC.

Fix word casing in the README

pre-commit autoupdate

https://pre-commit.com/#pre-commit-autoupdate

Changed `Actual` to `actual` mid sentence

Fix summary typo for `mrbgems/mruby-compar-ext`

Allow void expression on some places e.g. right hand of `rescue`
modifier. In addition, checks added on some places, e.g. left hand of
logical operators.

build(deps): bump github/super-linter from 4.8.4 to 4.8.5