From ColumnGroup to Label, improve table operations

• Add capability to create a set of IDs from column's values
• New table operation: make all the values in a selected column uppercase
• Add missing aliases to some expressions
• Rename ColumnGroup to Label
• Tweak several editors

r2.5.2

• Support for the Windows platform with R 3.4.3.

r2.5.1

• Set default name for heatmap and joined table
• Remove MetaR.R from the devkit
• Add action to load the table's columns

r2.5.0

• Migrate to MPS 2019.1.5.
• Use the Util plugin for common features across modules.
• Incorporate features from XChart plugin.
• Remove dependency from Editor2PDF plugin.
• Improve management of Docker containers.

r2.4.6

• Add Browse button to Covariate Table editor.
• Use R 3.5.1 inside the docker image.
• Remove local dependency on MPS extensions in the build script.
• Default docker preferences to use the new artifacts/metar image.

r2.4.5

• Minor fixes on column group annotations.