Bug 537632 - Meson Property Pages missing some fields after configure

- fix MesonPropertyPage logic concerning a configured meson project
- for possible values, add "-" and "/" as valid characters
- in state flow, don't just wait for blank lines, an option
  header can occur in the middle of a group or a new option group
  name can also occur

Change-Id: I2c6c8f9fb15db0425f03e422b20b58ace5234fd4
1 file changed