Enhancement for Issue #30/#34

[Max-Bladen]

This pull request adds the verbose.call parameter to the following methods:

• pca,
• spca,
• pls,
• spls,
• rcc,
• block.pls,
• block.plsda,
• block.spls,
• block.splsda,
• mint.pca,
• mint.pls,
• mint.plsda,
• mint.spls and
• mint.splsda

When TRUE, this parameter allows for all the variable values input into the method to be accessed via the output object (object$call). Also updated the documentation to accompany all of this. If coverage decreases significantly, will add more tests to compensate.

[Max-Bladen]

I believe this PR is ready for review @aljabadi. Just a few extra notes:

• I haven't adjusted my implementation as I never received a response to this comment. If you want this adjusted at all, just let me know.
• A quick summary as its a large set of commits. This PR includes:
  • Addition of the verbose.call parameter to all functions in the above list. This parameter adjusts the output $call component. If verbose.call = TRUE, then $call will contain the actual input values.
  • Addition of all relevant info to the documentation of each adjusted function.
  • Test file containing checks for usage of verbose.call. This is not permanent and will be replaced as part of PR #221. This is just here to ensure the coverage stays above the minimum.
• Still open to discussion on adjusting how this works/the range of functions it's implemented for.

[Max-Bladen]

Second set of commits on 14/12/2022 reflect initial set of commits, but replicated after the branch was rebased to master following PR #281.