PR for RaMS version 1.4.0

[wkumler]

From the NEWS:

• Added MS3 support to file reading and minification
  • MS3 data is not automatically requested with "everything" (the default) and must instead be added (e.g. grab_what=c("everything", "MS3"))
  • msdata$MS3 has an additional column (prepremz) corresponding to the MS1 trigger while the premz now corresponds to the immediately preceding MS2 m/z trigger.
• Added option to include polarity as a column per request from MetabolomicsWorkbench
  • Enable by setting incl_polarity = TRUE in grabMSdata()
  • Not enabled by default to preserve back-compatibility
  • Polarity is encoded as 1 for positive mode and -1 for negative mode
• Added function to edit the retention times of existing mzML/mzXML files (editMSfileRTs)
  • Still feels like it's in development, would love feedback on Github
• Swapped out demo files to test incl_polarity and MS3 data
• Updated tests and minification vignette to reflect new demo files

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 88.37209% with 40 lines in your changes are missing coverage. Please review.

Project coverage is 87.39%. Comparing base (fde5a5c) to head (7caeb64).

Files	Patch %	Lines
R/grabMzmlFunctions.R	84.46%	16 Missing :warning:
R/extraHelperFunctions.R	86.59%	13 Missing :warning:
R/grabMzxmlFunctions.R	89.13%	10 Missing :warning:
R/grabMSdataCode.R	92.30%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #33 +/- ## ========================================== + Coverage 85.57% 87.39% +1.81% ========================================== Files 6 6 Lines 1276 1587 +311 ========================================== + Hits 1092 1387 +295 - Misses 184 200 +16 ```

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