[WIP] Update initialization procedure

[rodrigomha]

The following PR provides initialization methods for each component. It also adds tests for AndersonMachines, and removes models for Kundur Machines that currently are not working. Now all the tests use RAW files to initialize the system.

Initializations to do:

• AVRSimple
• AVRTypeII
• PSSSimple
• TGTypeI

Test 11 of DynamicLines is waiting for update in PSY.

I will probably add a test for all of those devices together in a ThreeBusNetwork.raw. In addition, I think is possible to now properly create the LCFilter model. However, this possibly will create conflicts with states that will not longer exists, and will require the implementation of additional inverter inner vars.

[codecov]

Codecov Report

Merging #62 into jd/update_test_files will increase coverage by 10.34%.
The diff coverage is 90.98%.

@@                    Coverage Diff                    @@
##           jd/update_test_files      #62       +/-   ##
=========================================================
+ Coverage                 75.25%   85.59%   +10.34%     
=========================================================
  Files                        30       44       +14     
  Lines                      1075     1812      +737     
=========================================================
+ Hits                        809     1551      +742     
+ Misses                      266      261        -5     

Impacted Files	Coverage Δ
src/LITS.jl	100.00% <ø> (ø)
...itialization/inverter_components/init_converter.jl	0.00% <0.00%> (ø)
src/models/device.jl	100.00% <ø> (ø)
src/models/generator_models/shaft_models.jl	100.00% <ø> (ø)
...rc/initialization/generator_components/init_avr.jl	41.02% <41.02%> (ø)
src/models/system.jl	78.18% <66.66%> (-21.82%)	⬇️
src/base/file_system.jl	80.00% <80.00%> (ø)
src/base/simulation_initialization.jl	83.78% <83.78%> (ø)
src/base/simulation.jl	84.07% <90.90%> (-10.35%)	⬇️
src/initialization/generator_components/init_tg.jl	96.42% <96.42%> (ø)
... and 39 more