mate-session-manager 1.25.0 release

Changes since the last release: v1.24.0...v1.25.0

mate-session-manager 1.25.0

• Build: disable Serbian translations to fix building
• Translations update
• Change some icons by other always available
• gsm-properties-dialog: Refactor notebook scroll event
• Update compilation instructions
• Using #include with system libraries
• use libegg submodule
• Add git.mk to generate .gitignore
• Add tab scrolling support for GTK3
• build: silent build warnings for distcheck
• Accept Desktop Entry Specification v1.1
• build: do not override the default value for MATE_COMPILE_WARNINGS
• build: make libglesv2 optional