Add travis config and scripts

.travis.yml

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+os:
+  - linux
+
+sudo: required
+dist: trusty
+
+languages: c++
+compiler: gcc
+
+before_install:
+  - sh ${TRAVIS_BUILD_DIR}/.travis/before_install.sh
+install:
+  - sh ${TRAVIS_BUILD_DIR}/.travis/install.sh
+script:
+  - sh ${TRAVIS_BUILD_DIR}/.travis/script-linux.sh
+  - sh ${TRAVIS_BUILD_DIR}/.travis/script-macos.sh
+  - sh ${TRAVIS_BUILD_DIR}/.travis/script-win32.sh
+  - sh ${TRAVIS_BUILD_DIR}/.travis/script-win64.sh

.travis/before_install.sh

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+#!/bin/bash
+
+set -e
+
+sudo add-apt-repository ppa:kxstudio-debian/kxstudio -y
+sudo add-apt-repository ppa:kxstudio-debian/mingw -y
+sudo add-apt-repository ppa:kxstudio-debian/toolchain -y
+sudo apt-get update -qq
+sudo apt-get install kxstudio-repos
+sudo apt-get update -qq

.travis/install.sh

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+#!/bin/bash
+
+set -e
+
+sudo apt-get install -y \
+    g++ \
+    pkg-config \
+    libjack-jackd2-dev \
+    libgl1-mesa-dev \
+    libx11-dev \
+    apple-x86-setup \
+    mingw32-x-gcc \
+    mingw32-x-pkgconfig \
+    mingw64-x-gcc \
+    mingw64-x-pkgconfig

.travis/script-linux.sh

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+#!/bin/bash
+
+set -e
+
+# Preparation
+_FLAGS="-Werror"
+export CFLAGS="${_FLAGS}"
+export CXXFLAGS="${_FLAGS}"
+
+# Start clean
+make clean >/dev/null
+
+# Build now
+make

.travis/script-macos.sh

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+#!/bin/bash
+
+set -e
+
+# Preparation
+_FLAGS="-Werror"
+export CFLAGS="${_FLAGS}"
+export CXXFLAGS="${_FLAGS}"
+export MACOS_OLD=true
+export CROSS_COMPILING=true
+. /usr/bin/apple-cross-setup.env
+
+# Start clean
+make clean >/dev/null
+
+# Build now
+make

.travis/script-win32.sh

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+#!/bin/bash
+
+set -e
+
+# Preparation
+_FLAGS="-DPTW32_STATIC_LIB -Werror"
+_PREFIX=i686-w64-mingw32
+export AR=${_PREFIX}-ar
+export CC=${_PREFIX}-gcc
+export CXX=${_PREFIX}-g++
+export CFLAGS="${_FLAGS}"
+export CXXFLAGS="${_FLAGS}"
+export PATH=/opt/mingw32/${_PREFIX}/bin:/opt/mingw32/bin:${PATH}
+export CROSS_COMPILING=true
+
+# Start clean
+make clean >/dev/null
+
+# Build now
+make

.travis/script-win64.sh

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+#!/bin/bash
+
+set -e
+
+# Preparation
+_FLAGS="-DPTW32_STATIC_LIB -Werror"
+_PREFIX=x86_64-w64-mingw32
+export AR=${_PREFIX}-ar
+export CC=${_PREFIX}-gcc
+export CXX=${_PREFIX}-g++
+export CFLAGS="${_FLAGS}"
+export CXXFLAGS="${_FLAGS}"
+export PATH=/opt/mingw64/${_PREFIX}/bin:/opt/mingw64/bin:${PATH}
+export CROSS_COMPILING=true
+
+# Start clean
+make clean >/dev/null
+
+# Build now
+make