The implementation of keyword arguments is heavily rely on the prototype
made by @take-cheeze in #3629.

def m(a=1,**k) p [a,k] end
m(a: 1)

[mruby-socket] Network services might not be available

add mrbc option `--remove-lv`

* refactor: move `irep_remove_lv` from `mruby-bin-strip` gem to src/dump and rename to `mrb_irep_remove_lv`
* add: mrbc option `--remove-lv` to remove LVAR section

[mruby-test] Fix task name is not necessarily a valid path

Errno::ENOENT: No such file or directory @ dir_s_mkdir - mruby:Z:/Documents

Added ~/Android/Sdk/ndk-bundle as default NDK home

Support MRB_WITHOUT_FLOAT to mruby-io

Add information about Kernel#binding

Run tests parallelly for each target.

Increase sleep duration exponentially instead of `Thread.pass`.

Use Fiber#transfer instead in minirake.

Use `Thread.pass` instead of sleeping.

Fix job waiter of minirake.

Show minirake backtrace in verbose mode.

Use temporary file name for `File#mtime` test to avoid conflicts.

Make minirake parallel.