[TYPO3-core] RFC #7903: Code cleanup: PHP5ize t3lib_extMgm to bring in line with it's documentation.

[Kasper Ligaard]

This is an SVN patch request.
        
Type: Code cleanup

Bugtracker references: http://bugs.typo3.org/view.php?id=7903
        
Branches: TYPO3_4-2

Problem:
In the documentation for t3lib_extMgm it states:
        
"This class is never instantiated, rather the methods inside is called
as functions like t3lib_extMgm::isLoaded('my_extension');"
        
Now that we have PHP5 as a minimum we should make the function in
t3lib_extMgm 'public static'. Without running 'public static' E_STRICT
warnings are given to people using the class as documented, and not
giving errors to people using it wrongly (e.g. instantiating it)

Solution:
The attached patch adds 'public static' to all the function of
t3lib_extMgm.
        
Notes:
- I know Typo3 does not use E_STRICT, but I still think the proposed
change would benefit all.
- This patch request is similar to
http://bugs.typo3.org/view.php?id=7350
- I have found no place in Typo3 where t3lib_extMgm are instantiated, so
this change should be safe.
- I have never met places on the web where t3lib_extMgm are not
correctly used, so (again) this change should be safe.

PS: This is my first patch request. Please tell me if something was done
wrong :-)
        
Regards, Kasper
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