Fix: Correct XML encoding for commands. First step: createTaskCommand

[BaaaZen]

The API has a serious problem with creating the commands. You always concatenate strings with the XML tags, but you never encode the values. This works as long as you don't use any XML specific characters. I got a problem when I tried to create a task with an ampersand (&) in the name. So you should always encode all inserted strings!

I fixed the problem for the "createTaskCommand" on a clean way, as I only had the problem with that command. Maybe you could fix all the other commands, too?

I'll open an issue for that.

[davidak]

i have tested it and it works as before and also fixes the described issue.

[davidak]

@BaaaZen good catch. thanks for your contribution!

[codecov]

Codecov Report

Merging #39 into master will increase coverage by 0.02%.
The diff coverage is 9.09%.

@@            Coverage Diff            @@
##           master     #39      +/-   ##
=========================================
+ Coverage    5.97%   5.99%   +0.02%     
=========================================
  Files           6       6              
  Lines        1742    1751       +9     
=========================================
+ Hits          104     105       +1     
- Misses       1638    1646       +8

Impacted Files	Coverage Δ
gmp/gmp.py	12.06% <9.09%> (-0.02%)	⬇️

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