Add implementation for addMenuItem
Merge pull request #480 from wolfmanjm/upstreamedge

Add implementation for addMenuItem
make private
remove unused I2C based panels
Merge pull request #481 from wolfmanjm/cleanup/unused-i2c-panels

Cleanup/unused i2c panels
Squashed commit of the following:

commit 4eabd88eb9c53dbf45bb43b965be6c7e2d90a980
Author: stth1998 <stth1998@web.de>
Date:   Mon Aug 11 23:06:18 2014 +0200

    addition to commit bfdf666

    changed:
    src/modules/utils/panel/screens/PrepareScreen.cpp

    added initialization

commit ed824b1ad8f8532fadeace04824097a27045a473
Author: stth1998 <stth1998@web.de>
Date:   Mon Aug 11 23:01:52 2014 +0200

    addition to commit 9e0f582

    changed:
    src/modules/utils/panel/screens/CustomScreen.cpp

    initialization added

commit 9e04fe38da0fecbf8ef5373e28e179cab9e0f582
Author: stth1998 <stth1998@web.de>
Date:   Mon Aug 11 20:55:26 2014 +0200

    avoiding multiple string creation #2

    changed:
    src/modules/utils/panel/screens/CustomScreen.cpp
    src/modules/utils/panel/screens/CustomScreen.h

    std::string is 8 Bytes + heap allocations if set <-> const char * is 4 bytes + reused c string
    in line 83 in CustomScreen.cpp there is always a const char * string pointer assigend
    They do not need to be put into a string if the string's c_str() (const char*) is passed to send_command.
    the assigned ptr is sufficient, too.

    saves 4 bytes RAM (heap) (all the time) + strlen+1+padding bytes RAM (heap) (temporarily)
    also saves time for allocation and deallocation

commit bfdf666dc0b94e61f19e511284ba9dbba64ea7c3
Author: stth1998 <stth1998@web.de>
Date:   Mon Aug 11 20:50:54 2014 +0200

    avoiding multiple string creation #1

    changed:
    src/modules/utils/panel/screens/PrepareScreen.cpp
    src/modules/utils/panel/screens/PrepareScreen.h

    std::string is 8 Bytes + heap allocations if set <-> const char * is 4 bytes + reuse of c string literal
    command is only assigned in line 67 to 73 in PrepareScreen.cpp there are const char [] string literals assigend only.

    They do not need to be put into a string, if the string's c_str() (const char*) is passed to send_command.
    the assigned literal is sufficient, too.

    saves 4 bytes of RAM (heap) (all the time) + strlen+1+padding bytes RAM (heap) (temporarily)
    also saves time for allocation and deallocation when a command is executed

commit ba02d5f9c9b162e6dc58c7dae8983f1ec03769b2
Author: stth1998 <stth1998@web.de>
Date:   Mon Aug 11 19:19:29 2014 +0200

    respect memory alignment in class ControlScreen

    changed:
    src/modules/utils/panel/screens/ControlScreen.h

    putting the bool in one block with the two chars saves 4 bytes of RAM per instance due to memory alignment
Merge pull request #482 from stth1998/fix/menu_mem_savings_cleaned

Squashed commit from branch fix/menu_mem_savings