encoder uses layout for all message formating, but still prevents bla…

[fupgang]

Fixes #100

Formatting the message itself (including shortening, trimming, etc.) should be the sole responsibility of the pattern layout. Only the blank string handling has to be addresses – as you pointed out.

API-Breaks:

• removed maxShortMessageLength from GelfEncoder, has to be configured by the user with a suitable Layout
• renamed shortPatternLayout to shortMessageLayout
• renamed fullPatternLayout to fullMessageLayout

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.47%. Comparing base (1259b4a) to head (8a3ac4f).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #102      +/-   ##
============================================
+ Coverage     85.81%   86.47%   +0.66%     
+ Complexity      255      250       -5     
============================================
  Files            27       27              
  Lines           698      673      -25     
  Branches         72       67       -5     
============================================
- Hits            599      582      -17     
+ Misses           75       70       -5     
+ Partials         24       21       -3     

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