use pkgdepends for package installation

[rvalieris]

Hello, this is a followup on #78.

I see that @calderjo managed to get the build working, thats awesome !! I couldn't figure out how to make make_dependency_list work so I went a different direction, utilizing pkgdepends to do the package installation, I'm submitting the PR anyway in case its useful.

main changes are:

• sanitize the package list
  packages_users contains many entries that are obviously not packages such as empty string, single letters, and words that aren't packages such as "geom_text" (thats a function from ggplot2).
• use pkgdepends for installation

besides not having to mess with make_dependency_list, it can install packages from both CRAN and Bioconductor, and it also handles installing missing system libraries if the package declares them, these are the dependencies pkgdepends installed, besides the libraries that are already being installed on the Dockerfile:

p$show_sysreqs()

+ cargo - gifski + default-jdk - Deducer, JavaGD, JGR, OpenStreetMap, openNLPdata, RWeka, RWekajars, XLConnect, arulesCBA, bartMachine, bartMachineJARs, coreNLP, dismo, glmulti, h2o, openNLP, venneuler, rCBA, rJava, rcdk, xlsx + gdal-bin - sf, terra, concaveman, mlr, warbleR + jags - MBNMAdose, R2jags, mlr, rjags, runjags + libavfilter-dev - av + libboost-all-dev - RQuantLib + libgl1-mesa-dev - rgl + libgmp3-dev - Rmpfr, arrangements, PMCMRplus, gmp, mlr + libmpfr-dev - Rmpfr, PMCMRplus, mlr + libopenmpi-dev - ergm, mlr + libprotoc-dev - protolite + libquantlib0-dev - RQuantLib + libxslt-dev - xslt + pandoc-citeproc - bayesplot, footBayes, loo, rstanarm + pari-gp - elliptic + rustc - gifski + tcl - rriskDistributions, tcltk2 + texlive - animation, huxtable, texreg + tk - rriskDistributions, tcltk2 + tk-dev - rriskDistributions, tcltk2 + tk-table - rriskDistributions, tcltk2

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