clutter test: add Clutter::ColorizeEffect test
clutter test: Clutter::Canvas#scale_factor accessor is provided since clutter 1.18
clutter test: add omit test

Travis CI's clutter expects Clutter::Color expects hash arguments. :<
clutter test: omit Clutter::Color in setup instead of individual tests
clutter test: add Clutter::DesaturateEffect test
clutter test: add Clutter::BulrEffect test

Clutter::BlurEffect.new returns Clutter::Effect if success
clutter test: fix typo

bulr ->
blur
 ^^
clutter test: rename test-blur-effect.rb ->  test-clutter-blur-effect.rb

clutter tests filename are added prefix "test-clutter-".
clutter test: add Clutter::BrightnessContrastEffect tests
clutter: add rubyish method convert rule
clutter test: add test for rubyish converted methods
clutter test: rename test methods name
Revert "clutter: add rubyish method convert rule"

This reverts commit 9def9fa88ccbee7999e998989e65886425d31855.

This conversion rule is not suitable for Ruby-GNOME2 naming rule.
Sorry...
clutter: add Clutter::BrightnessContrastEffect::*_full wrapper methods
clutter: add require for wrapping *_full methods in Clutter::BrightnessContrastEffect
clutter: modify copyright year
vte3-gi test: add omit method

Vte.check_version? does not exist.
Instead of defines `omit_if_not_respond`.
vte3-gi test: include VteTestUtils
vte3-gi test: add rewrap_on_resize test

rewrap_on_resize has been provided since vte 0.36.
vte3-gi test: omit_if_not_respond can accept String and Symbol in second argument explicitly