renamed 'lamp' preset folder to 'light'

presets/pov/light/01_(5400K)_Direct_Sun.py

presets/pov/light/02_(5400K)_High_Noon_Sun.py

presets/pov/light/03_(6000K)_Daylight_Window.py

.../pov/light/04_(6000K)_2500W_HMI_(Halogen_Metal_Iodide).py

presets/pov/light/05_(4000K)_100W_Metal_Halide.py

presets/pov/light/06_(3200K)_100W_Quartz_Halogen.py

presets/pov/light/07_(2850K)_100w_Tungsten.py

presets/pov/light/08_(2600K)_40w_Tungsten.py

...pov/light/09_(5000K)_75W_Full_Spectrum_Fluorescent_T12.py

presets/pov/light/10_(4300K)_40W_Vintage_Fluorescent_T12.py

presets/pov/light/11_(5000K)_18W_Standard_Fluorescent_T8.py

...ets/pov/light/12_(4200K)_18W_Cool_White_Fluorescent_T8.py

presets/pov/light/13_(3000K)_18W_Warm_Fluorescent_T8.py

.../pov/light/14_(6500K)_54W_Grow_Light_Fluorescent_T5-HO.py

presets/pov/light/15_(3200K)_40W_Induction_Fluorescent.py

presets/pov/light/16_(2100K)_150W_High_Pressure_Sodium.py

presets/pov/light/17_(1700K)_135W_Low_Pressure_Sodium.py

presets/pov/light/18_(6800K)_175W_Mercury_Vapor.py

presets/pov/light/19_(5200K)_700W_Carbon_Arc.py

presets/pov/light/20_(6500K)_15W_LED_Spot.py