Improve the color picker to allow RGB values insert, Allow to search in a circular area, support search in a generic area(drawing a polygon)

Adding code to Mapstore mobile to permit user to select color via graphical mode or inserting rgb value for color desired(Issue #2).
Permit user to search inside a circular area(Issue #3).
Try to permit user to search inside a polygonal area, this function does not work at the moment, possible bug in spatialite library(Issue #4).