Fix parameter name in prototypes for the CCRTPPacket constructor

Also fix some bugs which likely got introduced because of this wrong name.
CCRTPPacket: make oneline functions inline, add const

Inline functions are much easyier to read and do improve maintainability.

Const attributes are necessary to use stuff in functions which are themself
const.
CCrazyRadio: make oneline functions inline, add const

Inline functions are much easyier to read and do improve maintainability.

Const attributes are necessary to use stuff in functions which are themself
const.
CTOC: make oneline functions inline, add const

Inline functions are much easyier to read and do improve maintainability.

Const attributes are necessary to use stuff in functions which are themself
const.
CCrazyflie: make oneline functions inline, add const

Inline functions are much easyier to read and do improve maintainability.

Const attributes are necessary to use stuff in functions which are themself
const.
CCrazyRadio: use references to const strings as parameter instead of copying strings
CTOC: use references to const strings as parameter instead of copying strings
CCrazyflie: use references to const strings as parameter instead of copying strings
Don't distribute the namespace std through headers

Not everyone wants the std namespace as default. Therefor use qualified names
in headers.
CCrazyRadio: fix length of received payload

The length of received data is wrong by one. Fix this.
Add .swp to .gitignore

Make VIM users happy.
CCRTPPacket: use std::string to hold payload in order to avoid new in constructor

Using new in constructors should be avoided because new might throw.
CCrazyflie: avoid new in constructor

Using new in constructors should be avoided because new might throw.
CCRTPPacket: big cleanup, it's now a header only

- make constructors inline
- make other functions (only 2 remained) inline
- remove spaces in otherwise emtpy lines
- remove unnecessary includes
CCRTPPacket: add enums for channels and ports
CCRTPPacket: Add default constructor
CCRTPPacket: Use default constructor
Add files generated by cmake to .gitignore

Ignore files generated by cmake in case some doesn't use a separate build
directory (e.g. by just using cmake -DCMAKE_BUILD_TYPE=release; make).
use enums
Remove unnecessary constructor