[addons] add callback function to get the MD5 digest of the given text

[AlwinEsch]

Description

Is needed on my test on GUI addon callbacks.

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the Code guidelines of this project
• My change requires a change to the documentation, either Doxygen or wiki
• I have updated the documentation accordingly
• I have read the CONTRIBUTING document
• I have added tests to cover my change
• All new and existing tests passed

[AlwinEsch]

jenkins build this please

[akva2]

Kodi is not a complete toolbox for everything needed by addons. kodiplatform was invented for stuff like this as there is no interaction with kodi needed.

[AlwinEsch]

@akva2 I understand you but in this case it is acceptable for me to have from Kodi.

Reasons are:

• It is only one function used, in case the whole class for them or something other becomes used makes it also no sense for me and is really better to have in kodiplatform.
• One another reason for me is to have it so simple as possible for addon developer. On Python addons can it be easily used with https://docs.python.org/2/library/md5.html and only add the line import md5 for C++ is it more complicated with add of external libraries.

[AlwinEsch]

My current requests are primary to bring in a new way for inputstream addons to allow encrypted streams. But want to have it also predefined as a basic framework for other languages in future.

[akva2]

it's a slippery slope and i would hold the principles high in this case. but it's not my call to make.

btw, the idea was to make kodi a consumer of kodiplatform. most generic utils in xbmc/utils would go there. that way all this code is available to kodi and its add-ons, and there is only a single version to maintain.

[AchimTuran]

@akva2

btw, the idea was to make kodi a consumer of kodiplatform. most generic utils in xbmc/utils would go there. that way all this code is available to kodi and its add-ons, and there is only a single version to maintain.

This sounds like a good way to go. So there would be no effort to maintain the callbacks. But this is not my call too as I don't have the huge overview like you both.
I also think moving this code to kodiplatform could be done later.

[ksooo]

What @AchimTuran said.

[AlwinEsch]

jenkins build this please