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/dfrorp/CMakeLists.txt

@@ -1,5 +1,5 @@
 upm_mixed_module_init (NAME dfrorp
-    DESCRIPTION "DFRobot analog oxidation reduction potential (ORP) sensor"
+    DESCRIPTION "Analog Oxidation Reduction Potential (ORP) Sensor"
     C_HDR dfrorp.h
     C_SRC dfrorp.c
     CPP_HDR dfrorp.hpp

src/dfrorp/dfrorp.hpp

@@ -43,7 +43,7 @@ namespace upm {
   /**
    * @library dfrorp
    * @sensor dfrorp
-   * @comname DFRobot ORP (Oxidation/Reduction Potential) Sensor
+   * @comname Analog Oxidation Reduction Potential (ORP) Sensor
    * @type liquid
    * @man dfrobot
    * @con ainput