doc: Scrubbed ALL sensor library descriptions

In an effort to clean-up and standardize UPM library
documentation, this commit updates (and in most cases,
unifies) the CMake description string AND CXX header
@comname string.

Strings were taken from datasheets when possible, spelling
mistakes were addressed, copy/paste errors where fixed,
Title Case was used, etc.

    * Tested/updated/added @web tags
    * Added/updated invalid sensor images
    * Added/updated @man tags, added missing manufacturers

Signed-off-by: Noel Eck <noel.eck@intel.com>

src/wheelencoder/CMakeLists.txt

@@ -1,5 +1,5 @@
 set (libname "wheelencoder")
-set (libdescription "DFRobot wheelencoder")
+set (libdescription "Wheel Encoder")
 set (module_src ${libname}.cxx)
 set (module_hpp ${libname}.hpp)
 upm_module_init(mraa)

src/wheelencoder/wheelencoder.hpp

@@ -39,7 +39,7 @@ namespace upm {
   /**
    * @library wheelencoder
    * @sensor wheelencoder
-   * @comname DFRobot Wheel Encoder
+   * @comname Wheel Encoder
    * @type other
    * @man dfrobot
    * @web http://www.dfrobot.com/index.php?route=product/product&product_id=98