Tool icons in 20px

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35822 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#4462 - Spreadsheet mouse listener refactored. Touch events working with spreadsheet.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35823 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Style changes for open screen

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35824 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e