Improve Travis CI test

- Add shell scripts to help with managing configs
- Clean up .travis.yml file by using shell scripts
- Don’t download “astyle” – not needed and delays Travis results

LinuxAddons/bin/build_marlin

@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+rm -rf .build/
+DISPLAY=:1.0 ~/bin/arduino --verify --board marlin:avr:mega  Marlin/Marlin.ino

LinuxAddons/bin/opt_disable

@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+eval "sed 's/\(\/\/ *\)*\(\#define *$1\)/\/\/\2/g' Marlin/Configuration.h"

LinuxAddons/bin/opt_enable

@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+eval "sed -i 's/\/\/ *\(#define *$1\)/\1/g' Marlin/Configuration.h"

LinuxAddons/bin/opt_enable_adv

@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+eval "sed -i 's/\/\/ *\(#define *$1\)/\1/g' Marlin/Configuration_adv.h"

LinuxAddons/bin/opt_set

@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+eval "sed -i 's/\(#define *$1\) *.*$/\1 $2/g' Marlin/Configuration.h"

LinuxAddons/bin/opt_set_adv

@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+eval "sed -i 's/\(#define *$1\) *.*$/\1 $2/g' Marlin/Configuration_adv.h"

LinuxAddons/bin/pins_set

@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+eval "sed -i 's/\(#define *$2\) *.*$/\1 $3/g' Marlin/pins_$1.h"

LinuxAddons/bin/restore_configs

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+
+cp Marlin/Configuration.h.backup      Marlin/Configuration.h
+cp Marlin/Configuration_adv.h.backup  Marlin/Configuration_adv.h
+cp Marlin/pins_RAMPS_14.h.backup      Marlin/pins_RAMPS_14.h

LinuxAddons/bin/use_example_configs

@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+eval "cp Marlin/example_configurations/$1/Configuration* Marlin/"