Razadarit era military history,three more episodes (c. 1403)

Added three more episodes in the military history of the Razadarit era (c. 1385-1421). The index to the Razadit era history now works also:

11. A momentary truce between Ava and Pegu and a fight for hegemony over Arakan

12. Ava marches south; Lagunein estimates the strength of Ava's forces

13. A monetary tax in lieu of troop levies for the town of Thakyin