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/pca9685/CMakeLists.txt

@@ -1,5 +1,5 @@
 set (libname "pca9685")
-set (libdescription "Pca9685 I2C 16ch, 12b pwm, LED controller")
+set (libdescription "I2C 16-channel 12-bit PWM LED Controller")
 set (module_src ${libname}.cxx)
 set (module_hpp ${libname}.hpp)
 upm_module_init(mraa)

src/pca9685/pca9685.hpp

@@ -46,7 +46,7 @@ namespace upm {
   /**
    * @library pca9685
    * @sensor pca9685
-   * @comname PCA9685 PWM Controller
+   * @comname I2C 16-channel 12-bit PWM LED Controller
    * @type led motor
    * @man adafruit
    * @web http://www.adafruit.com/products/815