Update colors in ALV converter + Drawing reference

[KonstantinKhrushchev]

Fix #1102
Optimization #1107

[larshp]

instead of using SAP standard data elements GUID_16 & GUID_32 which are not used in abap2xslsx currently, and also not released. Is it possible to use some of the already existing/used data elements?

[KonstantinKhrushchev]

change guid_16 -> zexcel_guid, guid_32 -> char32

[KonstantinKhrushchev]

@larshp thanks for review.
corrected

[darnoc312]

Do you think this is senseful for charts too ?
IF so provide it for charts too, else let it for charts in the previous way (counter).
Currently you have a mix for charts and ZDEMO_EXCEL39 does not work anymore because of not matching rId.

For the moment i included the following in CREATE_XL_DRAWINGS_RELS recovering the field lv_counter so it works again.
lv_counter must be counted always because the while loop in CREATE_XL_DRAWINGS does too.

[sandraros]

@darnoc312 Could you create a new issue and explain exactly what happens with ZDEMO_EXCEL39? (I don't get what means "does not work anymore because of not matching rId"; after that, you can propose a pull request containing your fix, text is always better than screenshot). Concerning the current issue, you can do an advance test in your system to see if the current fix works (pull the commit of the pull request). That will help us if you do a feedback on it. Thank you.