tree 57afd70618ffcdae1d8b50d10aafc9c1f3196679
parent c31bd60dbf9105f1568027c50c159844f8df052b
author Václav Kubernát <kubernat@cesnet.cz> 1559152004 +0200
committer Václav Kubernát <kubernat@cesnet.cz> 1567526212 +0200

Clean includes and usings

These changes are based on suggestions made by the include-what-you-use
tool. Some suggestions were not implemented because they did not
decrease build time (forward-declaring some classes), or because they
would make the include section too complicated (Spirit headers and MPL
headers). On my computer, this change decreases the build time by about
27%:

before
real	1m45.807s
user	5m40.648s
sys	0m18.274s

after
real	1m18.013s
user	3m57.866s
sys	0m12.946s

Change-Id: I11e4f30f4e7518506a213537daae9c41d52b4ac4