Add skyscrapers background by Dreamer.

Source: http://secretmaryo.org/phpBB3/viewtopic.php?f=10&t=4268#p28719
Add automn tree by Crabmaster and mrvertigo27.

Source: http://secretmaryo.org/phpBB3/viewtopic.php?f=10&t=3585#p25802
Add candle graphic by crabmaster.

Source: http://secretmaryo.org/phpBB3/viewtopic.php?f=10&t=3585#p25098
Replace green ground with graphics by crabmaster.

Source: http://secretmaryo.org/phpBB3/viewtopic.php?f=10&t=3498#p21413
Add "Morning in a castle" music by Nearbu.

Source: http://secretmaryo.org/phpBB3/viewtopic.php?f=11&t=4094#p25747
(cherry picked from commit 3599c6f7a0543fa0229d0af5983dba082a04e2a1)
Add Snowy Mountain music by Naerbu.

Source: http://secretmaryo.org/phpBB3/viewtopic.php?f=11&t=4090#p25723
(cherry picked from commit cd09a2e5771035452b01d38bf86ac5ba36ab1514)
Add Beatiful World music by Naerbu.

Source: http://secretmaryo.org/phpBB3/viewtopic.php?f=11&t=4128#p26189
(cherry picked from commit 09bd5b8b953b5607e03c95cc7eee3298f25d9c97)
Merge branch 'release-2.0.0' into devel