* R/shinyUI.R: Removed.
  A monolithic file that became difficult to maintain.

* R/shiny-ui-top.R: New file. Contains top-level server and interface
  functions.

(mk_ui): New function. Replace old mkUI and serve as a top-level user
interface definition function.

(mk_shinyscreen): Removed most of it. Only the top-level content
remains.

* DESCRIPTION: Updated.

* R/shiny-ui-base.R: New file. Shiny wrappers.

R/api.R (mk_comp_tab): New function.

* R/mix.R(get_set_mode): New function. Replaces and enhances
  getSetMode.

* R/shinyUI.R(getSetMode): Remove getSetMode.

* R/base.R (tab2file,file2tab): Return and write data.table objects.

(print_table): New function. Prints a data frame, or a table nicely.

R/api.R (vrfy_conf) : Modified assertions.

R/api.R(mk_mzml_tab): This version is script compatible.

* R/resources.R: Finally correct mode names.

* R/api.R: Validation on compound lists and sets.

* R/shinyUI.R(launch): New arguments.
Added ability to launch in script mode (if GUI=F).

* api.R (read_conf): Add a test.

api.R (run): New argument.
Use withr:with_dir to evaluate inside dir.

(run_in_dir): New function.
This is where the body will go.

(vrfy_conf): New tests.

DESCRIPTION: New dependencies.

NAMESPACE: New imports.

R/api.R (read_conf,vrfy_conf): New functions.

With dir

See merge request eci/shinyscreen!24

One can switch the project, do the extraction, but: the status lamps
are wrong (previous project) and plots throw errors.

This completely changes the way tags turned into the levels of the
rvTab$mzml table.

This way, we can control when the list of tags are synced with the
table. Also, empty spaces around tags are trimmed.