Steve Cotton 1c123fb3fa Allow '1-infinity' in ranges, and tighten the schema's validation of ranges
Fixes #4253.

The schema's validation of ranges now rejects negative numbers, because the C++
code doesn't support them (both before and after this commit):
* utils::parse_range("-7") will return {0,0}, because std::stoi("") throws invalid_argument.
* src/map/location.cpp will parse it as -7, but that will never match an on-map coordinate
2019-08-29 22:28:22 +02:00
..
2018-11-16 06:47:54 -08:00