[WIP] move formats to submodule (#236)

[ebroecker]

is this the way to restructure the formats to an own module?

[codecov-io]

Codecov Report

Merging #301 into development will decrease coverage by 0.79%.
The diff coverage is 86.11%.

@@              Coverage Diff               @@
##           development     #301     +/-   ##
==============================================
- Coverage        38.12%   37.33%   -0.8%     
==============================================
  Files               34       34             
  Lines             6833     6833             
  Branches          1669     1669             
==============================================
- Hits              2605     2551     -54     
- Misses            4014     4067     +53     
- Partials           214      215      +1

Impacted Files	Coverage Δ
src/canmatrix/formats/cmcsv.py	4.19% <ø> (ø)
src/canmatrix/formats/fibex.py	2.4% <ø> (ø)
src/canmatrix/formats/xls_common.py	3.33% <ø> (ø)
src/canmatrix/formats/xlsx.py	1.05% <ø> (ø)
src/canmatrix/formats/cmjson.py	67.22% <ø> (ø)
src/canmatrix/formats/kcd.py	1.78% <ø> (ø)
src/canmatrix/formats/arxml.py	11.37% <ø> (ø)
src/canmatrix/formats/dbf.py	1.94% <ø> (ø)
src/canmatrix/formats/dbc.py	50.39% <ø> (ø)
src/canmatrix/formats/sym.py	45.59% <ø> (ø)
... and 11 more

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[altendky]

I think so.