Charts export: add TIFF format to export capabilities

Add TIFF format to export capabilities of :

1. Swing chart composite (chart view export)
2. JFC charts engine (chart raw export)
3. R charts engine (chart raw export)

changed milestone to %TXM 0.8.5

added charts export type::feature labels

assigned to @sjacquot

changed the description

closed with commit 9eac83fa

changed milestone to %TXM 0.8.4