Add ./revdep folder output and script (#2790)

* Revdep check. 719 - CRAN, 117 - BioConductor; 0 new problems; 3 failed to check

* fix last few install failures.  836 pass. 0 untested. 0 failures.

* add revdep script

revdep/.gitignore

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+*.noindex*
+data.sqlite
+failures.md

revdep/README.md

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+# Platform
+
+|field    |value                        |
+|:--------|:----------------------------|
+|version  |R version 3.6.1 (2019-07-05) |
+|os       |macOS Catalina 10.15.3       |
+|system   |x86_64, darwin15.6.0         |
+|ui       |X11                          |
+|language |(EN)                         |
+|collate  |en_US.UTF-8                  |
+|ctype    |en_US.UTF-8                  |
+|tz       |America/New_York             |
+|date     |2020-03-05                   |
+
+# Dependencies
+
+|package |old   |new     |Δ  |
+|:-------|:-----|:-------|:--|
+|shiny   |1.4.0 |1.4.0.1 |*  |
+|rlang   |NA    |0.4.5   |*  |
+
+# Revdeps
+

revdep/problems.md

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+*Wow, no problems at all. :)*

revdep/revdep-cran-comments.md

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+## revdepcheck results
+
+We checked 836 reverse dependencies (719 from CRAN + 117 from BioConductor), comparing R CMD check results across CRAN and dev versions of this package.
+
+ * We saw 0 new problems
+ * We failed to check 0 packages

tools/revdep.R

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+
+# revdepcheck::revdep_reset()
+
+# maximize output width
+options(width = as.numeric(system2("tput", "cols", stdout = TRUE)) - 10)
+revdepcheck::revdep_check(pkgload::pkg_path("."), num_workers = detectCores() - 2, bioc = TRUE, timeout = as.difftime(30, units = "mins"))
+
+# save cran comments to a file
+cat(file = file.path(pkgload::pkg_path("."), "revdep", "revdep-cran-comments.md"), paste0(collapse = "\n", capture.output({revdepcheck::revdep_report_cran()})))