Installscripts in Updates.xml are ignored

On the latest master branch (i.e. commit 5b5ee638) install script sections within Updates.xml files (generated from the repogen binary) are ignored cause of the wrong capitalization of the tag name "Script".

Details:

• repogen copies config blocks named "Script" (defined in repositorygen.cpp #288)
• component.cpp reads in the script tag (component.cpp #312) with the defined constant "script" (constants.h #45)
• The key "script" can't be found in the data structure and therefore install scripts are ignored at all

Possible fixes:

• Change the defined constant to uppercase (all other comparisons are case insensitive as far as I've seen)
• Use another constant for the script tag itself (both in repositorygen and in package)
• ... ?

Hint: Changing the tag name in repositorygen.cpp to lower-case might not be a good idea as this breaks backwards compatibility (and documentation: http://doc-snapshot.qt-project.org/qtifw-master/ifw-component-description.html)

(Installer 1.6 is not affected as this was merged in later on.)