Initial travis and Appveyor configs

.travis.yml

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+sudo: false
+dist: trusty
+language: c++
+
+addons:
+  apt:
+    packages:
+    - cmake
+    - libxrandr-dev
+    - libudev-dev
+    - libopenal-dev
+    - libflac-dev
+    - libvorbis-dev
+    - g++
+    - clang
+
+before_script:
+- mkdir build && cd build
+- cmake .. -G"$GENERATOR" $CMAKE_FLAGS
+
+script:
+- sudo cmake --build . --target install
+
+matrix:
+  include:
+
+  # Linux - gcc
+  - os: linux
+    compiler: gcc
+    env:
+    - GENERATOR="Unix Makefiles"
+    - CMAKE_FLAGS="-DSFML_BUILD_EXAMPLES=TRUE"
+
+  # Linux - clang
+  - os: linux
+    compiler: clang
+    env:
+    - GENERATOR="Unix Makefiles"
+    - CMAKE_FLAGS="-DSFML_BUILD_EXAMPLES=TRUE"
+
+  # macOS - Xcode 10
+  - os: osx
+    osx_image: xcode10
+    env:
+    - GENERATOR="Xcode"
+    - CMAKE_FLAGS="-DSFML_BUILD_FRAMEWORKS=TRUE -DSFML_BUILD_EXAMPLES=TRUE"
+
+  # iOS - Xcode 9
+  - os: osx
+    osx_image: xcode10
+    env:
+    - GENERATOR="Xcode"
+    - CMAKE_FLAGS="-DCMAKE_TOOLCHAIN_FILE=../cmake/toolchains/iOS.toolchain.cmake -DSFML_BUILD_EXAMPLES=TRUE -DIOS_PLATFORM=SIMULATOR"
+
+notifications:
+  email: false

appveyor.yml

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+image:
+- Visual Studio 2017
+build_script:
+- ps: >-
+
+    md -Name build
+
+    cd build
+
+    cmake .. -DSFML_BUILD_EXAMPLES=TRUE
+
+    cmake --build . --target install