build

remove old CI files (travis, appveyor) (#1180) #156

Job	Run time
Ubuntu x86 Debug (Non-Portable)	6m 52s
WinXP x86 Release (Non-Portable)	19m 52s
Ubuntu x86 Release (Non-Portable)	7m 20s
Windows x86 Debug (Non-Portable)	5m 33s
WinXP x86_64 Release (Non-Portable)	16m 32s
macOS x86_64 Debug (Non-Portable)	6m 7s
Ubuntu x86_64 Debug (Non-Portable)	5m 0s
Windows x86 Release (Portable)	6m 56s
macOS x86_64 Release (Non-Portable)	9m 49s
Ubuntu x86_64 Release (Non-Portable)	5m 38s
Windows x86 Release (Non-Portable)	8m 12s
Windows x86_64 Debug (Non-Portable)	5m 34s
Windows x86_64 Release (Portable)	7m 15s
Windows x86_64 Release (Non-Portable)	7m 9s
create-latest	26s
create-release	0s
	1h 58m 15s

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