Add cross compilation targets for armv7 and aarch64

Cross.toml

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+[target.armv7-unknown-linux-gnueabihf]
+image = "iced-rs/armv7"
+xargo = false
+
+[target.aarch64-unknown-linux-gnu]
+image = "iced-rs/aarch64"
+xargo = false

docker/Dockerfile.aarch64-unknown-linux-gnu

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+FROM debian:buster
+
+RUN dpkg --add-architecture arm64 && \ 
+    apt-get update && \
+    apt-get install --assume-yes \
+    curl \
+    build-essential \
+    cmake \
+    g++-aarch64-linux-gnu \
+    git \
+    pkg-config \
+    libdbus-1-dev:arm64 \
+    libudev-dev:arm64 \
+    libxkbcommon-dev:arm64 \
+    libfontconfig1-dev:arm64
+
+RUN curl https://sh.rustup.rs -sSf | sh -s -- -y \
+    --default-toolchain stable \
+    --no-modify-path \
+    --profile minimal
+
+ENV RUSTUP_HOME=/root/.rustup \
+    CARGO_HOME=/root/.cargo \
+    PATH=/root/.cargo/bin:$PATH \
+    PKG_CONFIG_ALLOW_CROSS=1 \
+    PKG_CONFIG_PATH=/usr/lib/aarch64-linux-gnu/pkgconfig \
+    CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER=aarch64-linux-gnu-gcc \
+    CC_aarch64_unknown_linux_gnu=aarch64-linux-gnu-gcc \
+    RUST_TEST_THREADS=1    
+
+RUN rustup target add aarch64-unknown-linux-gnu

docker/Dockerfile.armv7-unknown-linux-gnueabihf

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+FROM debian:buster
+
+RUN dpkg --add-architecture armhf && \ 
+    apt-get update && \
+    apt-get install --assume-yes \
+    curl \
+    build-essential \
+    cmake \
+    g++-arm-linux-gnueabihf \
+    git \
+    pkg-config \
+    libdbus-1-dev:armhf \
+    libudev-dev:armhf \
+    libxkbcommon-dev:armhf \
+    libfontconfig1-dev:armhf
+
+RUN curl https://sh.rustup.rs -sSf | sh -s -- -y \
+    --default-toolchain stable \
+    --no-modify-path \
+    --profile minimal
+
+ENV RUSTUP_HOME=/root/.rustup \
+    CARGO_HOME=/root/.cargo \
+    PATH=/root/.cargo/bin:$PATH \
+    PKG_CONFIG_ALLOW_CROSS=1 \
+    PKG_CONFIG_PATH=/usr/lib/arm-linux-gnueabihf/pkgconfig \
+    CARGO_TARGET_ARMV7_UNKNOWN_LINUX_GNUEABIHF_LINKER=arm-linux-gnueabihf-gcc \
+    CC_armv7_unknown_linux_gnueabihf=arm-linux-gnueabihf-gcc \
+    RUST_TEST_THREADS=1    
+
+RUN rustup target add armv7-unknown-linux-gnueabihf