enhancements after overall code review

[pawelru]

• remove append_to_pmap
• remove std_preprocessing_map copy of already existing std_pmap
• consolidate importFrom tags
• clean-up examples not to call unnecessary libraries
• remove empty return roxgen
• rename introduction vignette so that it appears as the "package introduction" in the pkgdown website
• few prefixes
• lint/formatting

[github-actions]

Code Coverage Summary

Filename                           Stmts    Miss  Cover    Missing
-------------------------------  -------  ------  -------  ---------
R/aet01.R                            138     138  0.00%    38-320
R/aet02.R                            163     163  0.00%    53-413
R/aet03.R                             61      61  0.00%    41-142
R/aet04.R                             81      81  0.00%    46-164
R/assertions.R                        23      23  0.00%    21-46
R/assertthat.R                         1       1  0.00%    3
R/cmt01a.R                           132     132  0.00%    50-370
R/cmt02_pt.R                          29      29  0.00%    34-90
R/dm_explicit_na.R                    44      44  0.00%    47-125
R/dmt01.R                             20      20  0.00%    44-108
R/dst01.R                            212     212  0.00%    5-549
R/dtht01.R                            69      69  0.00%    46-177
R/egt01.R                             39      39  0.00%    45-121
R/egt02.R                             44      44  0.00%    42-190
R/ext01.R                             41      41  0.00%    39-174
R/gen_args.R                           1       1  0.00%    18
R/lbt01.R                             34      34  0.00%    43-111
R/mht01.R                             52      52  0.00%    39-123
R/sample_study_object.R               14      14  0.00%    14-35
R/standard_data_preprocessing.R      218     218  0.00%    52-505
R/utils.R                            137     137  0.00%    16-374
R/vst01.R                             40      40  0.00%    46-124
R/vst02.R                             44      44  0.00%    42-189
TOTAL                               1637    1637  0.00%

Results for commit: afe0408f247cf81b4f8b078d20b51ceb34b4c8cd

Minimum allowed coverage is 80%

♻️ This comment has been updated with latest results

[wangh107]

👍 Thanks for enhancement!