Change loading order of Chinese conversion tables

Change loading order of Chinese conversion tables

Apply the conversion variants from specific zones before zh-hans
and zh-hant, to allow fitting specific linguistic habits before
falling back to the generic ones. The actual rules will be added
in a followup patch.

Previously, the zh-cn table was composed by:

(1) Load zh2Hans as zh-hans table
(2) Load zh2CN + zh2Hans as zh-cn table
(3) Load Conversiontable/zh-hans + zh-hans as zh-hans table
(4) Load Conversiontable/zh-cn + zh-cn as zh-cn table
(5) Load zh-hans + zh-cn as the final zh-cn table

The new loading order is:

(1) Load zh2Hans as zh-hans table
(2) Load zh2CN as zh-cn table
(3) Load Conversiontable/zh-hans + zh-hans as zh-hans table
(4) Load Conversiontable/zh-cn + zh-cn as zh-cn table
(5) Load zh-cn + zh-hans as the final zh-cn table

Change-Id: Ie9d08b85d4911618946fa7efd23eb898412449e5