Release xmake v2.1.5 · xmake-io/xmake

#83: Add add_csnippet and add_cxxsnippet into option for detecting some compiler features.
#83: Add user extension modules to detect program, libraries and files.
Add find_program, find_file, find_library, find_tool and find_package module interfaces.
Add net.* and devel.* extension modules
Add val() api to get the value of builtin-variable, .e.g val("host"), val("env PATH"), val("shell echo hello") and val("reg HKEY_LOCAL_MACHINE\\XX;Value")
Support to compile the microsoft resource file (.rc)
Add has_flags, features and has_features for detect module interfaces.
Add option.on_check, option.after_check and option.before_check api
Add target.on_load api
#132: Add add_frameworkdirs api
Add lib.detect.has_xxx and lib.detect.find_xxx apis.
Add add_moduledirs api
Add includes api instead of add_subdirs and add_subfiles
#133: Improve the project plugin to generate compile_commands.json by run xmake project -k compile_commands
Add set_pcheader and set_pcxxheader to support the precompiled header, support gcc, clang, msvc
Add xmake f -p cross platform and support the custom platform

#87: Add includes and links from target deps automatically
Improve import to load user extension and global modules
#93: Improve xmake lua to run a single line command
Improve to print gcc error and warning info
Improve print interface to dump table
#111: Add --root common option to allow run xmake command as root
#113: Privilege manage when running as root, store the root privilege and degrade.
Improve xxx_script in xmake.lua to support pattern match, .e.g on_build("iphoneos|arm*", function (target) end)
improve builtin-variables to support to get the value envirnoment and registry
Improve to detect vstudio sdk and cross toolchains envirnoment
#71: Improve to detect compiler and linker from env vars
Improve the option detection (cache and multi-jobs) and increase 70% speed
#129: Check link deps and cache the target file
Support *.asm source files for vs201x project plugin
Mark add_bindings and add_rbi�ndings as deprecated
Optimize xmake rebuild speed on windows
Move core.project.task to core.base.task
Move echo and app2ipa plugins to xmake-plugins repo.
Add new api set_config_header("config.h", {prefix = ""}) instead of set_config_h and set_config_h_prefix

#83: 添加 add_csnippet，add_cxxsnippet到option来检测一些编译器特性
#83: 添加用户扩展模块去探测程序，库文件以及其他主机环境
添加find_program, find_file, find_library, find_tool和find_package 等模块接口
添加net.*和devel.*扩展模块
添加val()接口去获取内置变量，例如：val("host"), val("env PATH"), val("shell echo hello") and val("reg HKEY_LOCAL_MACHINE\\XX;Value")
增加对微软.rc资源文件的编译支持，当在windows上编译时，可以增加资源文件了
增加has_flags, features和has_features等探测模块接口
添加option.on_check, option.after_check 和 option.before_check 接口
添加target.on_load接口
#132: 添加add_frameworkdirs接口
添加lib.detect.has_xxx和lib.detect.find_xxx接口
添加add_moduledirs接口在工程中定义和加载扩展模块
添加includes接口替换add_subdirs和add_subfiles
#133: 改进工程插件，通过运行xmake project -k compile_commands来导出compile_commands.json
添加set_pcheader和set_pcxxheader去支持跨编译器预编译头文件，支持gcc, clang和msvc
添加xmake f -p cross平台用于交叉编译，并且支持自定义平台名

#87: 为依赖库目标自动添加：includes 和 links
改进import接口，去加载用户扩展模块
#93: 改进 xmake lua，支持运行单行命令和模块
改进编译错误提示信息输出
改进print接口去更好些显示table数据
#111: 添加--root通用选项去临时支持作为root运行
#113: 改进权限管理，现在作为root运行也是非常安全的
改进xxx_script工程描述api，支持多平台模式选择, 例如：on_build("iphoneos|arm*", function (target) end)
改进内置变量，支持环境变量和注册表数据的获取
改进vstudio环境和交叉工具链的探测
#71: 改进从环境变量中探测链接器和编译器
改进option选项检测，通过多任务检测，提升70%的检测速度
#129: 检测链接依赖，如果源文件没有改变，就不必重新链接目标文件了
在vs201x工程插件中增加对*.asm文件的支持
标记add_bindings和add_rbindings为废弃接口
优化xmake rebuild在windows上的构建速度
将core.project.task模块迁移至core.base.task
将echo 和 app2ipa 插件迁移到 xmake-plugins 仓库
添加set_config_header("config.h", {prefix = ""}) 代替 set_config_h 和 set_config_h_prefix

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