Parse command line using CLI11

This introduces some unavoidable incompatibility due to
CLI11 limitations.

CLI11 does not support multi-character options with single
dash. Previous options like -RH, -HWMON, and -SE can't be
implemented as is.

The replacement --hwmon options must specify a 0 or a 1.
it can no longer we specified alone, implying a 0.

CHANGELOG.md

@@ -7,5 +7,6 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 ### Fixed
 - Reconnecting with mining pool improved [[#1135](https://github.com/ethereum-mining/ethminer/pull/1135)].
 - Stratum nicehash. Avoid recalculating target with every job [[#1156](https://github.com/ethereum-mining/ethminer/pull/1156)].
+- CLI11 command line parsing support added [[#1160](https://github.com/ethereum-mining/ethminer/pull/1160)].
 ### Removed
 - Disabled Debug configuration for Visual Studio [[#69](https://github.com/ethereum-mining/ethminer/issues/69)] [[#1131](https://github.com/ethereum-mining/ethminer/pull/1131)].

ethminer/CMakeLists.txt

@@ -10,7 +10,10 @@ file(GLOB HEADERS "*.h")
 
 add_executable(${EXECUTABLE} ${SRC_LIST} ${HEADERS})
 
-target_link_libraries(ethminer PRIVATE ethcore poolprotocols devcore ethminer-buildinfo)
+hunter_add_package(CLI11)
+find_package(CLI11 CONFIG REQUIRED)
+
+target_link_libraries(ethminer PRIVATE ethcore poolprotocols devcore ethminer-buildinfo CLI11::CLI11)
 
 if(ETHDBUS)
 	find_package(PkgConfig)